M20, stalls in higher RPMS?

[CrJdMc]

So i have a 87 325is, This problem has recently occurred, and im not sure what it is, i changed the inline fuel pump, and the intank fuel pump, and i even swapped out ecus, im not sure what it could be, it has seemed to get a little better, but its still doing it, it also has a rough idle, if that means anything, thanks,
also, i dont know the exact rpms, because my tach is not working, but it will not hit limiter, if i had to guess, maybe around 4500.

My question is, does anyone know what it could be? maybe the AFM? im not sure.

[jlevie]

Check the switches in the TPS. If the WOT switch is bad the engine will struggle above 4500rpm.

[CrJdMc]

thanks man!